Chain saw



FIG. 1 is a right perspective view of a chain saw showing our design;

FIG. 2 is a left perspective view of a chain saw showing our design;

FIG. 3 is a front view thereof

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the chain sawand form no part of the claimed design.

CLAIM The ornamental design for a chain saw, as shown and described.